Question about Samsung HCM5525W 55" Rear Projection Television

3 Answers

After 45 min, Screen gets hazy and with green artifacts on the right of objects

Hi, this looks like an excellent forum for techs. I am a big DIY, but never attempted TV repair. Well here's my problem:

I just adopted a TV from a friend, and it is messing up on me. It starts up just fine (maybe a little green tint, but almost not noticeable). However after 30 minutes (around 45 minutes), the tv clicks and the tv gets all hazy. I'm including some pictures so you can see the difference between my startup case and the case where it gets hazy. If you have somewhere I can start, I'll gladly attempt it on my own. Let me know if there is any safety concerns I should be worried about as well. Thanks!

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  • 8 more comments 
  • ETdoFresh Sep 28, 2008

    Oh yes, here's the info on my TV:



    Samsung

    Model No.: HCM5525W

    SVC MODEL: HCM5525WX/XAA

    AVC 1209 60Hz 230W



    I know the pictures are not as professional as I would like to have taken them (with my cheap little digital camera). But I think it got the issue for the most part.

  • ETdoFresh Sep 29, 2008

    UPDATE: Now it is really intermittent. It almost never goes back to clear anymore. Just a green artifacts all along objects on the screen. Hope you can see it in the pic above. Thanks! - ET

  • ETdoFresh Oct 02, 2008

    Thanks justuscc, I'll give that a shot and let you know how it goes. I googled it, and one of the first featured sites had it for $7.99 each, where I payed a total of $22.93 for two chips with shipping and 6-month warranty.



    I got it here:

    http://www.suburban-elect.com/display/ST...

  • ETdoFresh Oct 03, 2008

    Well, I bought the STK392-040 as recommended by justuscc, and i'll try replacing that. But as I wait for this product to ship, i decided to take out the board. I'm having some trouble taking it out b/c 2 wires don't unplug, but that is besides the issue. I was looking on the board, and I notived this:






    Two things look like crushed plastic... I'm not sure if this is "normal" or something that may have fried. What does this look like to you?

  • ETdoFresh Oct 03, 2008

    But closer shot maybe:

  • ETdoFresh Oct 04, 2008

    Just added some more comments. Someone please check them out! Thanks!

  • ETdoFresh Oct 04, 2008

    Last thing (I hope, haha). Any idea how to take the wires off this little black box?




    Far view




    Close View



    Thanks!

  • ETdoFresh Oct 11, 2008

    FINALLY! It's fixed! Here's my part list and my procedure:



    PARTS LIST

    - Phillips Screwdriver

    - Soldering Iron and Solder

    - Desolder pump (Solder ******)

    - STK392-040 x 2 (2 Convergence ICs) $7.99ea

    - 100K POT x 2 (2 Variable resistors that are 25% and 0.3W) 2 for $1.00



    PROCESS:

    - Take off bottom back panel (where all the input connections are)

    - Unplug all cables from center board (remember/jot down what goes where)

    - Unscrew and take out the center board from television (there was one wire I couldn't remove, so I had to set the board just outside the television to work on it).

    - Unscrew STK392-040 from heat sink and remove heatsink

    - Desolder both STK392-040 and both burnt/fried resistors (RR402S and RR471S)

    - Solder new STK392-040 in, and solder two new POTS... set RR402S close to 100K and RR471S close to 50K

    - Put everything back, turn on TV.

    - Run "Perfect Focus" once, and enjoy!



    PS - If screen seems to big (doesn't fit in the TV frame, mess with the variable resistor settings). I believe RR471S was the size of the screen, and RR402S was the trapoid of the screen, but unsure.



    Thanks for your help justuscc and fixya.com... i would have had no idea where to start without y'all! Here are some more pictures! YAY!




    Overall picture of the center board pulled out




    Old and new convergence ICs




    Old burnt grey resistors and new blue resistors on board

  • ETdoFresh Oct 11, 2008

    Everything works, thanks to the techs that helped me!

    - JUSTUSCC
    - WELCOMEJEE
    - Ack, forgot the last tech, but started with an O i believe, so, thanks OCHU (sorry, thats the name I'm giving :)

  • ETdoFresh Oct 11, 2008

    One last comment, I tested the variable resistor with a multimeter, and it looks like they are still absolutely fine! I thought they were burnt, but I think welcomejee is right, it looks like one is set at 97.1K and the other is at 48.6K. So just becuase they look all messed up, it probably really is just glue.

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  • 10,594 Answers

These are two variable resistors has some glue on it for protection, means NOT to adjust it as already adjusted in factory.

After 45 min, Screen gets hazy and with green arti - d620d4d.jpg

now regarding pulling two wires, one thick wire can be pulled ( not in all cases) as shown in below picture. Push it and rotate it. If this not works, don't pull it force ly. just go to other end of this wire and try this method.

ef6c9da.jpg

LOL, my drawing isn't good :P

Posted on Oct 11, 2008

  • Shahid Electronics
    Shahid Electronics Oct 11, 2008

    Hey Congratulations on fixing your TV. :)
    You really did great job and thanks for feedback with pictures.
    Have nice time.




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  • 435 Answers

Do you hear any wierd sound when its hazy ? Try muting the TV and see.
From your description it sounds to me like voltage fluctuations.
If not externally, it might be internally.
Since this happens after a while, I believe this problem should be associated with a capacitor.
There should be a faulty capacitor inside which needs to be replaced. This is safe to be done by a technician.
And yea, it does not sound safe to use the TV when this happens.
if you still want to go by "DIY".
Try opening the TV and look for any burnt capacitor inside.
:)

Posted on Oct 02, 2008

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  • Master
  • 360 Answers

Well in most cases it is two IC`S the part number is STK392-040 these parts are soldered into the board. good luck

Posted on Oct 02, 2008

  • Jimmy
    Jimmy Oct 02, 2008

    also be carefull there are small resistors next to the ic you might need to test them after you resolder the ic's

  • Jimmy
    Jimmy Oct 12, 2008

    thats great good to hear its fixed....... justuscc

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